It's a BQM-74 target drone.


BQM-74E/CHUKAR SPECIFICATIONS
Length 12.95 feet
Diameter 1.1 feet
Wingspan 5.75 feet
Engine Williams International WR-24-8 turbojet, rated at 240 lb. of thrust
Speed range 200-540 knots
Altitude range (BQM-74E) 10-40,000 feet
(Chukar III) 10 ft (3 m)-40,000 ft (12,200 m)
Maximum range 520 nautical miles
(with extended range kit) 640 nautical miles
Maximum launch weight 595 pounds
Guidance Radio command or preprogrammed